Error while fetching data from PostgreSQL column "user2" does not exist - python-3.x

Question

My Django views.py passes a email address to a python function. The
python function queries a PostgreSQL table using a where clause. The
where clause is equal to the email address that was passed in
(someuser). My goal is to retrieve the userid value for this email
address. But I get an error message telling me that there is no column
called "user2" which is correct (there is not). But why does the
select see that as an existing column?
I print the email out only to verify that it got passed in. someuser
for select= user2#gmail.com
Error while fetching data from PostgreSQL
column "user2" does not exist LINE 1: SELECT userid from accounts_user
WHERE email = user2#gmail.c...
I have ran this locally on my Windows 10 box as well as on AWS Cloud9
with the same result. It tells me that no column exists that begins
with the email address up to the '#' sign.
import psycopg2
def get_userid(someuser):
try:
connection = psycopg2.connect(bla, bla")
cursor = connection.cursor()
print("someuser for select= ", someuser)
postgreSQL_select_Query = ("""SELECT userid from accounts WHERE email = %s;""" %(someuser))
cursor.execute(postgreSQL_select_Query)
mobile_records = cursor.fetchall()
for row in mobile_records:
print("userid = ", row[0], )
except (Exception, psycopg2.Error) as error :
print ("Error while fetching data from PostgreSQL", error)
finally:
if(connection):
cursor.close()
if __name__ == '__main__':
get_userid()
table has this:
id | email | userid
----+------------------------+--------
18 | user2#gmail.com | u48923
I expect to get the userid of "u48923" after running the select.

Answer 1

Change it to the following
postgreSQL_select_Query = ("""SELECT userid from accounts WHERE email = '%s';""" %(someuser))
But a better way is to use the built in functionality of psycopg2 and write it as follows
cursor.execute("""SELECT userid from accounts WHERE email = %s;""", (someuser,))
Psycopg2 Documentation

Answer 2

def getEmail(someuser): print("received someuser in 'run_select' from views.py= ", someuser) try:
connection = psycopg2.connect(user="my user",
password="xxxxxx",
host="127.0.0.1",
port="5432",
database="my_db")
cursor = connection.cursor()
print("again someuser for select= ", someuser)
someuser = str(someuser) # convert to string or you get: Error while fetching data from PostgreSQL can't adapt type 'User'
print("someuser= ", someuser)
cursor.execute("""SELECT userid from accounts_user WHERE email = %s""", (someuser,))
print("Selecting rows from c9_max_forms_kw using cursor.fetchall")
mobile_records = cursor.fetchall()
print("Print each row and it's columns values")
for row in mobile_records:
print("Id = ", row[0], )
#print("email = ", row[5])
#print("userid = ", row[9], "\n") # should be "u48923"
#save = ''.join(row[9]) # convert this tuple to a string except (Exception, psycopg2.Error) as error :
print ("Error while fetching data from PostgreSQL", error) finally:
#closing database connection.
if(connection):
cursor.close()
connection.close()
print("PostgreSQL connection is closed") return someuser
Joshua is the man. The string conversion was the key. The error given without it doesn't seem to make sense to me. Best to all. Ken.